This was published to the White House website on Saturday 27, but the state of emergency was declared on Friday 26.
The President today declared an emergency exists in the State of Louisiana and ordered Federal aid to supplement state and local response efforts in the parishes located in the path of Hurricane Katrina beginning on August 26, 2005, and continuing.
The President's action authorizes the Department of Homeland Security, Federal Emergency Management Agency (FEMA), to coordinate all disaster relief efforts which have the purpose of alleviating the hardship and suffering caused by the emergency on the local population, and to provide appropriate assistance for required emergency measures, authorized under Title V of the Stafford Act, to save lives, protect property and public health and safety, or to lessen or avert the threat of a catastrophe in the parishes of Allen, Avoyelles, Beauregard, Bienville, Bossier, Caddo, Caldwell, Claiborne, Catahoula, Concordia, De Soto, East Baton Rouge, East Carroll, East Feliciana, Evangeline, Franklin, Grant, Jackson, LaSalle, Lincoln, Livingston, Madison, Morehouse, Natchitoches, Pointe Coupee, Ouachita, Rapides, Red River, Richland, Sabine, St. Helena, St. Landry, Tensas, Union, Vernon, Webster, West Carroll, West Feliciana, and Winn.
Specifically, FEMA is authorized to identify, mobilize, and provide at its discretion, equipment and resources necessary to alleviate the impacts of the emergency. Debris removal and emergency protective measures, including direct Federal assistance, will be provided at 75 percent Federal funding.
http://www.whitehouse.gov/news/releases/2005/08/20050827-1.html